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RAS PhysicsГеомагнетизм и аэрономия Geomagnetism and Aeronomy

  • ISSN (Print) 0016-7940
  • ISSN (Online) 3034-5022

Solar Wind Low-Temperature Intervals and Forbush Decreases: A Statistical Comparison

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PII
10.31857/S0016794024050029-1
DOI
10.31857/S0016794024050029
Publication type
Article
Status
Published
Authors
M. A. Abunina
  • Affiliation: Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of Russian Academy of Sciences (IZMIRAN)
Volume/ Edition
Volume 64 / Issue number 5
Pages
608-623
Abstract
Based on a large amount of experimental material, the hourly values of the solar wind speed and proton temperature were compared; the expected proton temperature and the temperature index (the ratio of the observed temperature to the expected one) were calculated. Using the Cosmic Ray Variations Database, from 1997 to 2022 low-temperature intervals were identified (intervals lasting more 2 hours, in which hourly values of the temperature index less than 0.5). The work investigated: a) statistical relationships between the parameters of low-temperature intervals and the characteristics of Forbush decreases associated with different types of solar sources; b) distributions of parameters of low-temperature intervals for interplanetary disturbances containing or not containing a magnetic cloud. The results obtained showed that with increasing duration of the low-temperature interval, the proportion of events associated with ejections from active regions increases, and the proportion of recurrent events and events associated with ejections outside active regions decreases. The correlation of the parameters of low-temperature intervals with the amplitude of Forbush decreases is weak, with the equatorial anisotropy of cosmic rays – moderate, with the north-south anisotropy – significant. The solar wind speed and magnetic field strength correlate moderately with the temperature index, and the correlation of the range of these parameters with the duration of low-temperature intervals is significant or strong.
Keywords
Форбуш-понижения солнечный ветер межпланетные возмущения космические лучи
Date of publication
15.10.2024
Year of publication
2024
Number of purchasers
0
Views
41

References

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